S+S Regeltechnik AERASGARD RLQ-UP Notice D'instruction page 7

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Table Des Matières

Table des Matières

Les langues disponibles

Mounting and Installation

Automatic calibration of air quality (default), except for UP

The minimum initial value for air quality is memorized within a period of

ca. 4 weeks. After that period has lapsed, the output signal is stand-

ardised to zero-point (1.0 V). The maximum amount of correction is

thereby limited to 1 V ⁄ interval. In this way, long-term drifts and opera-

tional aging effects of the sensor element are completely eliminated.

Manual calibration of air quality, except for UP

Manual calibration can be started independently from the position of

jumper J3 by pushing the button. After connecting the device, a period

of at least 2 hours of continuous operation of the device at „normal" air

quality is to be ensured.

Manual calibration of the output signal to 1 V (zero-point) is started be

pressing the button „Manual calibration" (for ca. 5 seconds). Preparing

for calibration is indicated by a blinking LED.

Setting the output to 1 V at actual ambient conditions follows automati-

cally thereafter. During this phase, the LED is permanently activated.

After calibration is completed, the LED is deactivated.

Putting in operation

Upon energizing the device, a self-test and tempering takes place.

Depending on ambient conditions, this process takes 3 to 5 minutes.

During that time, the output analog voltage deviates from the actual

measured value.

Air quality is measured through a VOC sensor (metal oxide). Due to its functional principle, the lifetime of the sensor depends on nature and concen-

tration of the pollutant gas burden. The sensitive layer of the sensor element reacts with all volatile organic compounds and is thereby modified in its

electrical properties or "exhausted". This process results in a displacement of the characteristic curve. Such characteristic curve displacement

however amounts to less than 15 % ⁄ year under normal burden. In measuring air quality, the general condition of air quality is detected. Whether

air quality is "good" or "bad" is differently interpreted by each person.

Different pollution burdens and concentrations influence the air quality signal (0...10 Volt) in different ways. Examples for this are cigarette smoke,

deodorant sprays, cleaning agents, or also various adhesive materials for floor and wall coverings as well as dyestuffs. Increased burdens e.g. by

solvents, nicotine, hydrocarbons, aerosol propellants etc. intensify consumption ⁄ aging of the sensor element. Particularly under high pollutant gas

burdens – also during non-operational idle state periods of the devices (transport and storage) – zero-point drift will occur. Consequently, this must

be corrected at site according to the respective circumstances or basic burdens.

Air quality measuring instruments of different manufacturers cannot directly be compared because of different functional principles, preset basic

burdens (zero-point), and permitted burdens (amplification ⁄ sensitivity). Devices are preset respectively calibrated according to the sensor manufac-

turer's specifications. Here, a zero-point and a final value is determined and thus a maximum burden. In particular cases, exceeding measuring

ranges or excessive basic burdens on the devices will occur (outgassing floor carpeting, wall paint, etc.). In order to enable distinguishing different

air qualities, devices need to be adjusted by the customer according to the conditions existing on site that do not correlate to the factory-preset

definition range and calibration. Please note that factory calibration is thereby lost and compliance with technical data can no longer be guaranteed.

Type ⁄ WG1

Measuring Range

VOC

RLQ - UP

R L Q - U P

0 ...100 %

R L Q - U P - S

0 ...100 %

Note:

This unit must not be used as safety-relevant device!

Setting

Output